Men who don't use their erections lose them, Finnish researchers find.

Aging men who have sex at least once a week have only half the risk of developing erectile dysfunction as do men who have sex less often.

But once-a-weekers shouldn't gloat. More sex means even less ED risk. Men who have sex at least three times a week are only one-fourth as likely to get erectile dysfunction as are men who have less-than-weekly sex.

Regular sexual activity preserves potency in a similar fashion as physical exercise maintains functional capacity, conclude Juha Koskimaki and colleagues at the University of Tampere, Finland.

The findings come from questionnaires mailed to Finnish men aged 55 to 75. Only the 989 men who did not have erectile dysfunction at the beginning of the study - and who returned a second questionnaire five years later - were included.

Interestingly, the study found that men who have less than one morning erection per week are 2.5 times more likely to get erectile dysfunction as are men who have two or three morning erections per week. But having a morning erection every day did not lower a man's risk of erectile dysfunction.

One major limitation of the study, Koskimaki and colleagues note, is that they did not ask the men about masturbation, which might conceivably have the same salubrious effect on erectile dysfunction as intercourse. So as far as the researchers can tell, the study findings apply only to sex with another person.

Doctors should support patients' sexual activity, they conclude.

Koskimaki and colleagues report their findings in the July 2008 issue of The American Journal of Medicine.

An increasing number of 70 year olds are having good sex and more often, and women in this age group are particularly satisfied with their sex lives, according to a study published recently.

Knowledge about sexual behaviour in older people (70 year olds) is limited and mainly focuses on sexual problems, less is known about "normal" sexual behaviour in this age group.

Nils Beckman and colleagues from the University of Gothenburg in Sweden, studied attitudes to sex in later life among four representative population samples of 70 year olds in Sweden, who they interviewed in 1971-2, 1976-7, 1992-3, and 2000-1. In total, over 1 500 people aged 70 years were interviewed about different aspects of their sex lives including sexual dysfunctions, marital satisfaction and sexual activity.

The authors found that over the thirty year period the number of 70 year olds of both sexes reporting sexual intercourse increased: married men from 52% to 98%, married women from 38% to 56%, unmarried men from 30% to 54%, and unmarried women from 0.8% to 12%.

In addition, the number of women reporting high sexual satisfaction increased, more women reported having an orgasm during sex and fewer reported never having had an orgasm.

While the proportion of women reporting low satisfaction with their sex lives decreased, the proportion of men reporting low satisfaction increased. The authors suggest that this might be because it is now more acceptable for men to admit "failure" in sexual matters.

They also note that the number of men reporting erectile dysfunction deceased, whereas the proportion reporting ejaculation dysfunction increased, but the proportion reporting premature ejaculation did not change.

What do I do when my love is away. (Does it worry you to be alone) How do I feel by the end of the day (Are you sad because you're on your own) No, I get by with a little help from my V's, Mmm I get high with a little help from my V's, Mmm I'm gonna to try with a little help from my V's

Sexually-transmitted infections have doubled in under a decade in people over 45 and are now rising faster than in the young, research suggests.

The Health Protection Agency study said internet dating and erectile dysfunction drugs were partly to blame.

Men were most likely to be affected, with increases in herpes, syphilis, gonorrhoea and genital warts.

The study was  published in Sexually Transmitted Infections.

The number of sexually transmitted infections is rising in both young and old, despite sexual health campaigns urging people to avoid unsafe sex.

The Health Protection Agency (HPA) looked at people coming to clinics in the West Midlands between 1996 and 2003. The vast majority of these were younger people - accounting for more than 95% in 2003. However, the proportion of over-45s rose during the preceding eight years.

In total, 4,445 infections were detected in older people, with genital warts accounting for almost half of these diagnoses. Herpes was the next most common, with one-in-five diagnoses.

The overall rate of infections more than doubled over the eight-year period from 16.7 per 100,000 population to 36.3 per 100,0000.

Dr Babtunde Olowokure, from the HPA's regional surveillance unit in Birmingham, said: Older people are increasingly likely to be single or undergoing relationship changes and are less likely to consistently use condoms, perhaps because the risk of pregnancy no longer exists. Increased international travel, internet dating, new drugs to counter erectile dysfunction and overlapping sexual networks may also be factors.

The government said using a condom was relevant for anyone having unsafe sex...regardless of age.